Critical Care Nursing Cardiac Questions

Correct Answer: A

Rationale: The correct answer is A: Increase functional residual capacity. Positive end-expiratory pressure (PEEP) helps increase the functional residual capacity by keeping the alveoli open at the end of expiration. This prevents alveolar collapse, improves ventilation-perfusion matching, and enhances oxygenation. B: Prevent collapse of unstable alveoli - This is incorrect because PEEP actually helps prevent the collapse of all alveoli, not just unstable ones. C: Improve arterial oxygenation - This is partially correct, but the primary mechanism through which PEEP improves oxygenation is by increasing functional residual capacity. D: Open collapsed alveoli - This is incorrect because PEEP helps prevent alveolar collapse rather than actively opening already collapsed alveoli.

Correct Answer: D

Rationale: The correct answer is D: Elevate the head of the bed 45 degrees while recording pressures. Rationale: 1. Elevating the head of the bed will help improve the patient's breathing by reducing the pressure on the diaphragm. 2. This position will also help alleviate the patient's anxiety and tachypnea, promoting better oxygenation. 3. Recording pressures in this position will provide accurate data for monitoring the patient's condition. Summary: A: Limiting the supine position to 10 seconds does not address the underlying issues causing the patient's anxiety and tachypnea. B: Administering anxiety medications without addressing the positioning issue may not effectively manage the patient's symptoms. C: Encouraging the patient to take slow deep breaths is helpful, but changing the position of the patient is more crucial in this situation.

Correct Answer: C

Rationale: The correct answer is C because it explains that the decision to remove life-sustaining treatments is based on the fact that these treatments are not helping the patient and may actually be causing discomfort. This rationale aligns with the principle of beneficence, which emphasizes doing good and avoiding harm to the patient. It also respects the patient's autonomy by prioritizing their well-being and quality of life. Choice A is incorrect as it focuses on financial reasons rather than the patient's best interest. Choice B is incorrect because it prioritizes hospital resources over individual patient care. Choice D is incorrect as it lacks clarity and may come across as insensitive to the significant other's concerns.

Correct Answer: A

Rationale: The correct answer is A because in ARDS, there is a severe impairment in gas exchange leading to hypoxemia. Decreasing PaO2 levels despite increased FiO2 administration indicate poor oxygenation, a hallmark of ARDS. Elevated alveolar surfactant levels (Choice B) do not directly correlate with ARDS pathophysiology. Increased lung compliance with increased FiO2 administration (Choice C) is not characteristic of ARDS, as ARDS leads to decreased lung compliance. Respiratory acidosis associated with hyperventilation (Choice D) is not a typical finding in ARDS, as hyperventilation is usually present in an attempt to compensate for hypoxemia.

Correct Answer: C

Rationale: Rationale: 1. Acute tubular necrosis (ATN) is the most common intrarenal condition as it directly affects kidney tubules. 2. ATN is characterized by damage to renal tubular cells due to various factors like toxins or ischemia. 3. Prolonged ischemia (choice A) can lead to ATN but is not the most common intrarenal condition. 4. Exposure to nephrotoxic substances (choice B) can cause ATN, but ATN itself is more common. 5. Hypotension for several hours (choice D) can result in ischemia and subsequent ATN, but ATN is still the primary intrarenal condition.